Battery operated electric shaver



NOV- 1, 1966 R. A. soMr-:Rs ETAL BATTERY OPERATED ELECTRIC SHAVER Original Filed Jan. 11, 1960 5 Sheets-Sheet 1 INVENTORS Nov. 1, 1966 R. A. SQMERS Em. 3,283,185

BATTERY OPERATED ELECTRIC SHAVER 3 Sheets-Sheet 2 Original Filed Jan. 1l, 1960 FIG.7

FIG.6

INVENTORS RAYMOND A. SOME/Q5 ROBERT J. TOLM/E Nqv. 1, 1966 R, A. soMERs ETAL 3,283,185

BATTERY OPERATED ELECTRIC SHAVER Original Filed Jan. 11. 1960 3 Sheets-Sheet 5 INVENTORS RAY/110Mo A. S0/ums ROBERT /A MLM/E United States Patent Otlce 3,283,185 BATTERY OPERATED ELECTRIC SHAVER Raymond A. Somers and Robert J. Tolmie, both of Fairfield, Conn., assignors to Sperry Rand Corporation, New York, N JY., a corporation of Delaware Original applicationv Jan. 11, 1960, Ser. No. 1,546. Divided and this application June 16, 1965, Ser. No. 481,997

Claims. (Cl. S10-47) This invention relates to new and useful improvements in portable electrical appliances and particularly to assembly structure thereof and motor structure used therein and is a division of our copending application Serial No. 1,546 tiled January l1, 1960.

The invention is directed to assembly structure for a portable electrical appliance such as a shaver having a casing .mounting a suitable cutting mechanism and having a compartment in the casing `for housing the motor for operating the -cutting mechanism and rechargeable batteries in which .the cutting mechanism, motor and rechargeable batteries may all be mounted on one support` ing section of the casing -for convenience in constructing and assembling the parts of the shaver into voperative relation and in servicing and checking the assembled shaver mechanism. to obtain the desired efficiency in operation. By assembling the Shaver in this manner, operation of all parts of the shaver can be observed in their assembled relation before the remaining casing portions are mounted in place on the supporting section.

The `invention provides a shaver casing formed to carry cutting means on the outer side thereof and provide a compartment within the shaver casing containing an electric motor and rechargeable .batteries connected to the motor `for operating same through manual control by a switch having a handle manually operable from .the exterior of the casing, together with electrical cont-acts adapted to interengage with a charger casing in which the charger and shaver casings 4have interengaiging portions for detaoha'bly mounting said casings in engaged relation to connect a charger circuit and means to the rechargeable batteries so that upon plugging a connecting cord from the charge-r unit into a-n electrical current supply outlet of conventional form, the batteries in the shaver casing can be recharged at intervals. The interengaging parts on the charger and shaver casings may preferably be formed so that the casin'gs can be interengaged in only one position relative to one another.

The invention provides an electric shaver in which the shaver has a supporting portion .mounting the cutting means in outwardly projecting relation on one side and an electric motor drive for the cutting means on the opposite side within the casing together with rechargeable batteries connected in circuit with the motor and an electric switch means manually operable to turn the motor on and oif and having handle portion projecting through an opening in the casing for manual operation from the exterior of the casing. The invention further provides tor the attachment of a casing section enclosing the motor, rechargeable batteries and switch, in detachable relation on .the supporting portion for the motor, batteries and switch, so that terminal portions on the motor may have the attaching members securing the casing section enclosing the motor thereto, in circuit with the motor, while circuit connections to the battery also project through the casing wall.

The invention provides an electric shaver having cutting means projecting outwardly from a supporting portion of a shaver casing which carries the electric motor on the supporting portion together with batteries for operating the motor .and a control switch mounted on the motor and having a handle portion extending through the casing 3,283,185 Patented Nov. 1, 1966 for manual control of motor operation from the exterior of the casing. This provides a shaver construction in which the shaver motor can be operated vth the casing section enclosing the motor and batteries removed from the supporting section without interfering with the control of the motor by the operation of the switch.

The invention provides an electric shaver wherein a supporting portion if the casing carries the electric motor drive on one side thereof `for the cutting means mounted on the outer side and projecting outwardly from the casing, in which the supporting portion formed of suitable insulating material, such as plastic, also forms an end member for the electric motor having the stator for the motor engaged at one end with the supporting member and carrying another supporting or cap member on the opposite end of the stator suitably attached by clamping means .to the supporting section of the casing for assembling the motor on the supporting section. The supporting section and cap member are provided with bearings for rotatably mounting the opposite ends of the motor armature shaft having the armature engaged within the stator and the commutator adjacent one of the end members of the motor. The end member or cap member for the motor carries brushes for engaging a commutator on the armature shaft to conne-ct the armature coil windings in circuit with a source of electrical supply such `as fa battery .mounted in the shaver casing -on the supporting section adjacent to the motor. Terminal members are mounted on the cap or end member .for the motor to which the circuit to the brushes is connected. These terminal members are provided with screw threads so that screws extending through the supporting portion of the casing engaged with these terminal members will secure the end or cap member to the supporting portion in order to assemble the motor on the supporting portion or section of the shaver casing. Attaching screws may also be engaged with the cover section of the casing extending about the motor and batteries to engage the supporting section in which the screws are engaged in the terminal members lon the end or caep member of the motor. This will provide a circuit connection Idirectly to the motor for operation of the motor independent of the battery.

The battery circuit has prongs attached to the end cap for the motor which is formed of insulating material which project outwardly through the cover section of the casing into socket portions formed in the cover section of the casing for detachable engagement of complementary interengaging portions on a charger casing containing portions of a charging means for the batteries within the shaver casing so that the batteries may be recharged from a source of electrical energy to which the charger casing may be `detacfha'bly connected by a cord and plug connection attached .to the charger casing.

The invention provides an electric shaver in which the supporting section of the casing forms one end member for the motor with .another end or cap member provided for the opposite end of 'the motor having the stator engaged between these end members. These end mem-bers are preferably formed of non-magnetic material which .may also be insulating material, such as plastic, for retaining a stator member between the e-nd ymembers in assembled operative relation with respect to an armature having an armature shaft with opposite ends rotatably mounted in lbearings carried by the end members. These supporting members may be `formed to -carry 1a plurality of permanently magnetized pole pieces forming the stator poles `arranged in spaced parallel circumferential relation .about the outside of the armature with the means attaching the supporting members or end members of the motor together and retaining the stator poles in a similar relation with the armature to provide a complete motor assembly. The stator provided by the present invention includes a cylindrical sleeve of magnetizable material extending between the non-magnetic end members and arranged for having predetermined sections tlhereof permanently magnetized to provide stator poles for the motor, while the :armature is provide-d with electrical windings connected with a commutator having brushes supported :by one of the end members engaged with the commutator `for connecting the motor with a source of electrical supply to rotate the armature through a predetermined electromagnetic cooperation between the permanently magnetizied pole pieces and the armature.

The invention provides an electric motor for Shavers and the like having a stator formed of a cylinder of magnetizable material with the inner and outer faces in concentric relation and a metallic sleeve member formed with a longitudinal slot providing a split sleeve member slidably engaged on the cylindrical member. The magnetizable cylindrical stator member is permanently magnetized to form a plurality of spaced poles for cooperation with the armature poles to rotate the armature when electricity is supplied to coil windings on the armature through the usual commutator. The stator having a split sleeve enclosing the cylindrical member provides a magnetic circuit adapted to concentrate the magnetic field within the sleeve for producing an efficient operation of the armature-enclosed thereby. The split sleeve and cylindrical member have their positions fixed wi-th respect to one another by a key slot construction at one end of each member to fix the position of the members relative to each other and also provide for fixing the position of the pole sections of the stator so that the stator can be positioned in the supporting members in predetermined relation with respect to commutator brushes, commutator and poles on the armature, to obtain efficient operation of the motor.

In the drawings:

FIG. 1 is a side elevation of a battery operated electric dry shaver and a charger in engaged relation and in which shaver is incorporated an embodiment of the present invention.

FIG. 2 is a bottom plan view of the shaver.

FIG. 3 is a top plan view of the charger.

FIG. 4 is a vertical longitudinal cross-section through the shaver charger assembly as shown in FIG. l.

FIG. 5 is an inside elevation showing the supporting section of the casing.

FIG. 6 is an end elevation of the shaver and charger assembled as shown in FIG. 1 with portions broken away and shown in cross section.

FIG. 7 is a longitudinal cross section of the shaver with the casing portions broken away and shown in cross section for illustrating the motor and battery assembly in side elevation.

FIG. 8 is a side elevation of the plug contact member with the adjacent portions of the charger casing shown in cross section.

FIG. 9 is a bottom plan view of the plug contact member.

FIG. 10 is an end elevation showing the supporting or cap member of the motor assembly and the control switch.

FIG. 11 is an inside elevation showing the inner face of the supporting or cap member which engages the end of the stator assembly.

FIG. 12 is a cross section taken on line 12-12 of FIG. 7.

FIG. 13 is a cross section taken on line 13-13 of FIG. 6.

FIG. 14 is a longitudinal cross section through the electric motor stator and armature assemblies.

FIG. 15 is a cross section taken on line 15-15 of FIG. 14.

FIG. 16 is a cross section taken on line 16-16 of FIG. 14.

FIG. 17 is an enlarged fragmentary side elevation of yas clearly shown in FIGS. 4 and 5. Supporting section 1 forms an end member and support for the electric shaver motor. Supporting section 1 is preferably formed of non-magnetic material and for the purpose of the present invention both the supporting and the cover section of the casing are formed of a suitable plastic which incorporates insulating properties, as well as being non-magnetic. The side of supporting section 1 facing cover section 2 is formed in the center portion with an aperture extending through the supporting section, a thrust bearing seat 4 in the form of a recess opening toward the interior of the casing to receive thrust vbearing 5. Supporting section 1 is formed with an annular fiange 6 defining a recess 7 formed about thrust bearing seat 4. Recess 7 extends inwardly from the inner face of supporting section 1 a greater distance than annular recess 8 forming a stator seat. Annular flange 6 extends inwardly toward the rear face of supporting section 1 a short distance from the inner end of annular recess or stator seat 8 and is formed with a key projection 9 extending into recess 8 for fixing the position of the stator when engaged with supporting section 1 in a manner which will be hereinafter described. Supporting section 1 is formed with radial channels 10 to provide air circulation through the inside of the motor for cooling purposes.

A permanently magnetized stator assembly 11 is provided for the electric motor or machine. Stator 11 for the motor illustrated in the drawings is tubular and more specifically of cylindrical form having a length of approximately three-fourths of an inch. The inside diameter of the stator is approximately seven hundred sixtythousandths of an inch. The stator has an inner cylindrical field member 12 with -an inside diameter of approximately seven hundred and sixty thousandths of an inch as stated above and a thickness of approximately one hundred fifty thousandths of an inch. The outside diameter of inner field member 12 would be approximately one and sixty -thousandths inches. Inner field member 12 has sliding frictional engagement with an outer split ring 13. Split ring 13 has a thickness of approximately sixty two thousandths or one sixteenth of an inch. Outer split ring 13 is formed of sintered powdered iron. Inner field member 12 is formed of barium ferrite molded into cylindrical shape. Outer split ring 13 has a slot extending longitudinally of approximately one-sixteenth of an inch in width. Opposite the slot in outer split ring 13, one end of split ring 13 is formed with an inwardly extending key projection 14 adapted to fit in one of key slots 15 formed in opposite ends of inner field member 12 in longitudinally aligned relation. Key slots 15 in field member 12 and key projection 14 on split ring 13 cooperate to fix the relation of field member 12 to split ring 13 when these tw-o parts are assembled together to form the stator for the electrical machine or motor.

The `assembled inner field member 12 and split sleeve 13 are permanently magnetized at a pair of opposite p0rtions to form a pair of stator poles with the centers of the poles aligned in radial relation with said longitudinal slot in sleeve 13 and key slots 1S. The arcuate section of a magnctized pole extends circumferentially through an larc of approximately ninety degrees from the axis of the sleeve. The outer cylindrical surface of assembled stator 11 is provided with an insulating covering 16. This covering may be a suitable type for insulating fabric secured to the outer surface of stator 11 by a suitable adhesive :and is provided for the purpose of protecting the stator against adjacent parts having electrical contact therewith. This covering 16 further provides a means for placing tension on the outside of split ring 13 to firmly secure this ring on inner fieldI member 12'. The outside diameter of stator assembly 11 is approximately one and twenty-one hundredths inches.

Key slots 15 are also provided for fixing the position of stator assembly 11 in the end members for the motor or electrical machine. Key slot 15 in one end of inner field mem'ber 12 is adapted to receive key projection 9 in :annular recess 8 forming the stator seat when one end of stator assembly 11 is engaged in recess 8 until the end wall of the stator engages the bottom of recess or stator seat 8. The position of the stator is therefore xed by key 9 and key slot 15 relative to supporting section 1 for a purpose that will be hereinafter described.

Supporting end or cap member 17 is engaged on the opposite end ofstator assembly 11. Supporting member 17 is formed of `a plate portion having a recess 18 formed to receive the end of stator assembly 11 and la key projection 19formed to engage in key slot 15 in the engaged end of stator 11 for fixing the position of supporting o1 cap member 17 relative to supporting member 1. Cap member 17 has the center portion formed with a bearing projection 20 extending outwardly from the side opposite recess 18 therein to provide a cylindrical housing :arranged in coaxial relation with the stator assembly and mounting a Commutator shaft bearing 29 in the outer end wall. Supporting or cap member 17 is formed of non-magnetic material of a suitable type and in the case of the present invention is forme-d of molded plastic material to provide an insulated end member for the motor or electrical machine. The outer periphery of member 17 is of generally rectangular shape and .at a pair of opposite corners is provided with threaded metal -bushings 21 pressed in the plastic of the cap member. These bushings are located on portions of cap member 17 projecting beyond the outer surface of stator assembly 11 and are open at both ends so that -screw threaded fastenings may be received in opposite ends of each bushing extending in substantially parallel relation to the outer surface of cylindrical stator assembly 11. Supporting section 1 forming a cap or end member for the motor or electrical machine is provided with apertures aligned with metal bushings 21 for receiving attaching screws 22. Attaching screws 22 operate to firmly `secure cap member 17 and stator assembly 11 in assembled relation on supporting sections or endmember 1 in which thrust bearing 5 and bearing 29 are in axially aligned relation.

Supporting `or cap member 17'is formed with radially extending Ventilating slots 26 on the inner face` to provide for air passage between the inside of stator assembly 11'and the space in the casing outside thereof.

Cover section 2 is secured to supporting section 1 by having attaching screws 23 engaged in sockets 2-41` in end wall25 of the cover section. Screws 23 extend through apertures in end wall 25 `and are threadedly engaged in the ends of metal 'bushings 21 molded in cap member 17. When screws 23 are tightened in the bushings 21 after cap member 17 is secured by screws 22 to supporting section 1, cover 2'will be firmly secured with the open edge engaged on seat 3 of supporting section 1 to retain the shaver casing in assembled relation for enclosing the motor and other parts `to be described.

Cover sectionV 2 `has the free edge formed with positioning recesses 27 and 27' of different size on opposite side portions thereof which receive positioning projections 28 andZS' on opposite sides of supporting section 1 in .seat 3. This arrangement provides for assembly of cover section 2 on supporting section 1 in only one position to insure a fixed relation between cover section 2 and cap member 17.

An armature 3d 'has an armature shaft 31 with opposite ends rotatably mounted in bearings 5 and 29 to rotatably support the armature in axial relation with stator assembly 11. Armature shaft 31' mounted in bearing 5 has `a thrust bearing cone 32 mounted on the end of the shaft for engaging thrust bearing 5 to maintain the armature in a fixed position for rotation by having thrust bearing cone 32 constantly engaged with thrust bearing 5 to maintain the position of the armature against axial movement during rotation. The means for accomplishing this will be hereinafter described.

The intermediate portion of armature shaft 31 is provided with a knurled surface 33. An armature body 34 is formed of a plurality of laminations each `formed to provide a central section 35, radially extending arms 36 and pole pieces 37 at the outer ends of said arms. These laminations are of uniform size and shape, are assembled in registering relation to form radial arms on the armature body extending from the central portion, have the pole pieces at the outer ends of the body arranged in circumferential relation and an outer arcuate surface `having the same radius from the center of the armature shaft. These laminations are formed with the usual insulating material covering and are engaged in face-to-face contact to form an assembled laminated armature body 34. This body is pressed on to shaft 31 `by having a hole forming the central aperture in the body of a size adapted to engage knurled surface 33 for rigidly holding the armature body in position on an intermediate portion of the armature shaft so thatrshaft will rotate therewith. The outer arcuate face of each pole piece on the armature body has a length extending through an arc of ninety degrees projected from the axis of armature shaft 31. The sides of pole pieces 37 overhang the sides of arms 36. The gap 'between the ends and adjacent pole pieces 37 extends through an arc equal to about 1/3 the length of the arcuate face of one pole piece.

Plastic spools 38, preferably formed of molded nylon, are provided with central cylindrical portions 39 adapted to be slidably engaged on armature shaft 31 at opposite ends of armature body 34. Spools 3S have radially extending arms 41) and heads 41 corresponding in shape to arms 36 and pole pieces 37 of armature body 34. Center cylindrical portions 39, arms it and heads 41 of spool 38, have a slightly larger dimension than the corresponding parts of armature body 34, so as to extend beyond the sides 37 and outwardly beyond center section 35 of the armature body. Laterally extending flanges 42 are formed on marginal portions of center portions 39, arms 4t) and heads 41 to engage over the surfaces of the central portion, the sides and the inner faces of the pole pieces of the armature body for covering and insulating same. Theinner ends of laterally extending flanges 42 on each spool member extend inwardly toward the flanges on the spool member at the opposite end to sufiicient extent to space and insulate wire coil windings 43 usually wound fromenamel coated small guage copper wire, fro-m contacting metallic edges of the laminations of the armature body.

Av Commutator 44 is mounted on the end of armature shaft 31 enga'gedin bearing 29 adjacent the end of central cylindrical portion 39 of adjacent plastic spool 33. Commutator 44extends into cylindrical bearing extension 20 formed on plastic cap member 17, `as shown in FIG. 4. Commutator 44 is formed of a molded plastic body 45, such as Bakelite, and has a central bore formed to engage over shaft 31 and engage knurled surface 33 on shaft 31. Mol-ded plastic body 45 is pressed on to the knurled portion ofshaft 31 to rigidly secure the commutator on the shaft to rotate therewith. The outer surface of body 1S-'carries a plurality of Commutator segments 46 arranged in cylindrical relation about the outer surface of the body. The outer ends of the segments are spaced a small distance apart sufficientto insulate each segment from the other. Each Commutator segment is of arcuate form and has they inner surface formed with longitudinally extending channels 47 having the molded plastic material of body 45 lling these channels and locking segments 46 in cylindrical relation on the outer surface of the body. The inner ends of each segment are provided with tabs 48 outwardly in inclined relation therefrom for the purpose of having the ends of coil windings 43 soldered thereto to place the coil windings in electrical circuit connection with the commutator segments. The armature segments are equal in number to the coil windings on the armature and are arranged in aligned axial relation with the pole pieces of the armature body. A compression spring 49 or thrust member is engaged between bearing 29 and the outer end of commutator 44, as shown in FIG. 4 to maintain thrust bearing cone 32 in constant bearing engagement with thrust bearing 5 to prevent end wires vibrating movement of the armature during rotation thereof in the operation of the electrical machine or motor. This retention of the armature shaft against axial movement during operation, retains the armature body with the windings in centered relation between the ends of stator 11. The armature body has .a length equal approximately to half the length of stator 11.

Supporting or cap member 17 has radially extending square channels 50 formed in the plate portion thereof for slidably receiving and guiding square commutator brushes 51 having the inner ends engaging the cylindrical surface of commutator 44 and commutator segments 46 to provide an electrical circuit through commutator segments 46 with armature coils 43. A pair of these commutator brushes 51 are mounted in diametrical relation in cap member 17 and have flexible wire leads 52 secured to the outer ends thereof and connected to connect members on cap member 17. Springs 53 have a plurality of loops slidably engaged on metal bushings 21 adjacent cap member 17 with opposite ends extending outwardly therefrom in tensioned relation. One end extends into a slot cornmunicating with square channels 50 and has a laterally extending terminal portion engaging' the outer end of commutator brush 51 `for normally moving the brush inwardly to retain the inner end in engagement with the communtator segments. Two springs 53 are provided, one for operating each brush. The other end of each spring is engaged with the outer surface of cap member 17. Flexible wire leads 52 have the free ends attached to contacts 54 and 55 secured on the outer face of end cap 17 by a Harige on metal bushings 21, one contact being secured to each bushing.

With the exible wire leads 52 from commutator brushes 51 secured to contacts 54 and 55 having electrical connection with bushings 21 at a pair of opposite corners of cap member 17, an electrical circuit connection is provided through the brushes with screws 23 securing cover section 2 of the casing in position. The heads on screws 23 are located and exposed on the outside of end wall 25, as shown in FIG. 2. This provides a connection so that a suitable source of electrical supply can be directly placed in circuit with the armature windings for operating the motor when desired.

The intermediate corners of end or cap member 17 have prong members 56 and 56 mounted thereon by rivets or `other suitable means. Contact 54 is formed with a flexible arm extending toward prong member 56 and carries a contact point at the free end thereof opposite prong member 56 for engaging a contact point on prong member 56. The arm on contact 54 is resilient and normally moves the contact carried thereby away from the contact on prong member 56 so as to open the electrical circuit between contact 54 and prong member 56. Contact 55 has a fuse wire connection providing a circuit between one of the commutator brushes and prong member 56 for a purpose to be presently described.

A control switch 60 has :a cylindrical sleeve portion 61 rotatably engaged over the cylindrical outer surface of bearing projection on cap member 17 with the end of the sleeve portion adjacent to the outer face of plate portion 17. The outer e-nd of sleeve portion 61 has a radial segment 62 formed thereon and a handle projection 63 projecting .axially outward from the centnal portion of radial segment 62. Cylindrical sleeve portion 61 of control switch 60 is formed with a longitudinally extending rib 64 and the opposite side of said sleeve portion is formed with longitudinally extending spaced parallel grooves 65 for controlling rotation of the control switch between on and olf positions. Contact 55 has .a resilient arm extending at right angles thereto formed with a V-shaped end lportion engaging in one of the longitudinally extending spaced parallel grooves 65 for retaining control switch 60 i-n either the on or off positions. In the on position of control switch 60 longitudinal rib 64 operates contact arm 54 to engage prong member 56 to close the electric circuit to the motor through prong member 56.

Cover section 2 of the easing has van inwardly extending wall portion 66 termina-ting in .a retraining wall 67 formed with a double wedge-shaped slot 68 in which the outer ends of slo-t 68 are wider than the centlal portion. Slot 68 is formed in cover section 2 to receive outwardly projecting handle projection 63 on control switch 60 so that it is housed within the recess provided by cylindrical wall portion 466 and retaining wall 67. Retaining wall 67 has the inner face positioned in adjacent relation to the outer face of radial segment 62 on control switch 60 for effectively retaining control switch 60 in rotatable engagement with bearing projection 20 of cap member l17. The edges of retaining Wall 67 forming double lwedge-shaped slot 68 provide means for limiting the rotative movement of control switch 60 between the on and off positions. The outer face of radial segment 62 of control switch 60, is provided adjacent opposite ends of handle projection 63 on opposite sides thereof with the designations on and olf for indicating to the riser of the shaver the position in which the switch is located. End wall 2.5 of cover section 2 is formed with inwardly extending projections 69 and 70 integral in part with cylindrical wall portion 66 and forming an interruption in the :cylindrical shape of Wall portion 66, las shown in PIG. i6, lfor providing sockets opening through the outer f-ace of end Wlall 25 Iand having the inner end formed with a rectangular slot to slidably receive prong members 56 in projection 70 and prong member 56 in projection 69 carried by end supporting member 17 of the motor. Each of the sockets formed by projections 69 and 70 are formed of a different shape to prevent engagement of a contact member in the socket having a shape other than the shape of the socket. The purpose of this will be hereinafter described in connection With illustrating how the user is prevented from engaging Ian attachment plug in the sockets 69 and 70 formed in end wall 25 in other than one position determined by the shape of Ithe socket.

Supporting section 1 of the casing has two pairs of inwardly extending angularly arranged projections 7-1 formed ,adjacent the end cap portion or 'bearing support formed in section 1 for the the motor. These pairs of projections provide two cradles at opposite sides of the motor :and at the end portions of supporting section l to receive and support one end of a pair of storage batteries 72 at opposite sides :and parallel to stator aslsembly 11. Supporting or cap member 17 has opposite ends aligned with the ends of supporting section 1 formed to provide .a pair of cradle portions for the opposite ends of the pair of batteries so they may be rigidly supported on the shaver in parallel relation to the motor at opposite sides thereof and over opposite ends of supporting section 17 within cover section 2. These storage blatteries 72 are retained in position in the cradle projections 7'1 and on end member 17 by means of .a -retaining -band 73. Retaining band 73 may be in the form of a fabric strip provided on one face with a suitable adhesive, su-ch as pressure sensitive adhesive, which may be tightly stretched entirely around the outside of both Q storage batteries 72 and the intermediate portion of stator assembly 11 'for firmly retaining the storage batteries engaged with their cradles. These storage batteries are electrically connected in series with the electric motor through commutator 'brushes 51. yFor this purpose, the outside casing of each battery forms the negative terminal battery and the end oap on lone end forms the positive terminal. The outside casing of one battery 72 has a strip or wire connection attached thereto and connected to contact 55. A fuse wire connects contact 55 to prong member 56; as indicated at 74. The center contact of the other battery 7.2 is connected lby wire 75 to prong member `56. The central terminal of the first mentioned battery 72 is connected to the casing of the second mentioned battery 72 by a wire 76. This connects the batteries in series with each other and with commutator 44 through comm-utatoir brushes 51 under the control of control switch 60 which is operable to open and close the circuit through the motor by the operation of the flexible contact arm :on contact 545.

A charger 80 in the form of a separate unit mounted in charger casing 81 is adapted for detachable connection to the shaver casing. Charger casing Sl has a pair of oppositely formed casing sections provided with projections on one casing section for inter-engagement in complementary relation with sockets in the other casing section to hold the casing sections with the edges engaged in casing forming relation to provide a compartment for the charging means and other elements housed therein. One casing section is provided with bores to receive attaching screws adapted to be threaded into sockets in the other casing section aligned with the bores in assembled relation for threadedly receiving the screws to secure the two casing sections together. Charger casing 81 has an attaching wall portion 8?. with the intermediate portions of the wall offset inwardly from the marginal portions of the sides and ends of the casing to provide an open end recess on the attaching wall for receiving end Wall of cover section 2 of the shaver casing in engaged relation therein with the marginal portion of attaching wall 82 engaging the marginal seat portion 83 formed on cover section 2. This arrangement xes the position of the charger casing in its engaged relation with the shaver casing when the two casings are attached together.

Attaching wall portion 82 has a rectangular central opening formed therein and a ledge 85 offset inwardly in substantially parallel relation to attaching wall 82 to define the margins of the rectangular opening and cooperate with wall portion 82 to define a guide channel for slidably receiving the marginal portions of a plug contact member 86. Ledge 85 and the channels formed between ledge 85 and attaching wall portion 82 cooperate to engage and retain plug contact member 86 detachably connected with the casing sections in assembled relation. Plug contact member 86 may he formed of nylon or other similar plastic material to provide a flat plate portion 87 of substantially rectangular form having the marginal portion thereof engaged in the channels forming the edges of the rectangular aperture in attaching wall 82.

A pair of opposite corners of plate member 87 are formed with outwardly extending plug projections 86 and 89 Plug projection 88 has three sides arranged in position to form a substantially square shape with rounded corners while one corner is beveled to provide a special outside shape for the side walls of the plug projecting from plate member 87. Plug projection 55S is formed with a chamber to receive spring contact member 90 formed with a crimped portion on the inner end engaged over an inwardly extending contact support 91 formed on plate member S7 at the base of projection 8S in inwardly extending relation from the plate member. Plug projection 89 has three side walls arranged in substantially square relation, the two opposite side walls having a shorter length than the connecting side wall with rounded corners joining the three side walls. The remaining portion of plug projection 89 is formed in triangular relation extending from the free edges of the opposite parallel side walls to form a rounded projection with tapered side walls connected with the spaced parallel side walls. This provides a shape for plug projection 89 that is different from plug projection 88. A spring contact member 92 is mounted in plug projection 89 and has the outer end extending into the charger casing and supported on contact support 93. Spring contact members 9i) and 92 extend to the outer ends of plug projections 88 and S9 respectively. The outer ends of plug projections 88 and 39 have rectangular slots formed therein to receive the ends of prong members 561 and 56 respectively, when plug contact member 86 has plug projections 88 and 89 engaged in the sockets formed by inwardly extending projections 69 and '70 respectively. Plug projection S8 is formed to correspond with the shape of the socket in inwardly extending projection 69 while plug projection 89 is formed to t and slidbly engage in the socket formed in inwardly extending projection 70. When plug projections 88 and 89 are engaged in sockets in inwardly extending projections 69 and 7i), prong projections 561 and 56 slidably engage in plug projections 88 and 89 through the slots formed in the outer ends thereof for slidably engaging with spring contact members 9i) and 92, respectively, to provide an electrical circuit connection between the spring contact members carried by the charger casing and prong projections 56 and 561 carried by cap member i7.

Plate member 87 has a pair of spaced parallel switchoperating projections g4 formed on the outer face thereof projecting outwardly in parallel diagonal relation between plug projections 36 and 89 toward the intermediate opposite corners of the plate member. One inner face at the opposite end of each projection is formed with an inclined cam portion 95. When charger casing S1 is slidably engaged with the shaver casing with plug projections S8 and 89 engaged into the sockets formed in wall 25 of cover section 2, the movement of the charger casing into engagement with the shaver casing will move switch operating projections 94 toward handle projection 63 on control switch 6i). lf control switch 60 is in the on position causing the motor circuit to be closed for operation of the motor from the batteries, inclined cam portions 95 on each switch operating projection 94 will engage opposite ends of handle projection 63 and move the handle from the on position to the off position as the charger casing is moved into full interengaged relation with the shaver casing. This provides an automatic manual operation of control switch 60 during manual engagement of the charger casing with the shaver casing to open the circuit between the storage batteries and the shaver motor. This insures that the shaver motor is not running while the storage batteries are being charged by the charging means which may be partially contained in the charger casing and partially contained in the shaver casing in which the charging circuit for the storage batteries is connected between the charging and shaver casings by engagement of spring contact members and 92 with prong members 56' and S6.

During engagement of the charger casing with the shaver casing, handle projection 63 on control switch 60 has the outer edge portion engage plunger 96 slidably mounted in plate fmember 87 :between switch operating projections 94- in the center of the plate portion. Plunger 96 is provided with an enlarged head portion at the inside end adjacent plate member 87 having a pin on the inner end thereof extending into a slot in movable contact 97 detachably mounted on terminal projection 98. The head on plunger 96 engager the central portion of movable contact 97 on opposite sides of the slot so that when handle projection 63 engages the outer end of plunger 96 it will move .the plunger inwardly through plate member 87 and cause the free end of movable contact 97 to en- `gage the free end of stationary contact 99 mounted on terminal projection 100. Terminal projections 93 and 100 are rformed at opposite intermediate corner portions of plate member 07 in inwardly extending relation from the inner face thereof to support movable and stationary contacts 97 and 99 respectively, in spaced relation inwardly of the inner face of plate member 87. These contacts control the charger circuit connections in the charger casing to open and close the circuit with a source of electrical supply to which the charger casing may be connected. It will be understood lthat the charger circuit is closed only when the charger casing is in full attached relation with the shaver casing in the manner hereinabove described, at which time handle projection 63 in operating plunger 96 moves and holds movable contact 97 engaged with stationary contact 99.

The charger circuit which may include portions mounted in the chargercasing and portions mounted in .the shaver casing includes a conventional type of dry -plate rectiiier indicated at 101. This dry plate rectifier 101 -rnay include a selenium type rectifier having a pair of spaced terminal plates 102 with a selenium plate 103 engaged between the pair of terminal plates 102 to form a rectifier cell. Four of these cells made up of plates 102 -and 103 are preferably employed which are connected in a bridge circuit indicated at 104 in the wiring diagram in FIG. 19.

A condenser 105 has one terminal connected with one terminal of the bridge circuit by a wire 106 and the opposite terminal connected by wire 107 to one terminal of resistor 108 and terminal 109 of t-he terminal member 110 mounted in the socket portion 111 formed in one end of the charger casing. The other terminal 112 of the terminal :member mounted in socket portion 111 is connected by a wire to fuse member 113. The other terminal of fuse 113 has a wire connection to stationary contact 99. Movable contact 97 is connected 'by a wire 114 to the other terminal of resistor 108 and the opposite corner of bridge 104 from the connection of wire 106 therewith. Terminal members 109 and 112 in socket portion 111 form attaching prongs for receiving a plug connection from an attaching cord adapted to be detachably connected therewith and having a plug on the opposite end of the cord for engagement in the usual conventional outlet socket of a 110-volt electrical supply circuit of the conventional form found in most buildings. A bridge 104 from those to which wires 106 and 114 are connected, have wire connections 115 to spring contact member 92 forming the positive side of the charging circuit extending through prong member 56 carrying the contact terminal having a wire connection with the positive terminal of the storage battery. Wire 116 connects the other end of intermediate contact of bridge 104 with the negative terminal of the storage battery by being secured to spring contact member 90 engaging prong member 56 having an electrical connection wit-h the casing of one of the storage batteries. v

While two storage batteries are illustrated in the disclosure in the drawing of the present application, it will be understood that any number of storage batteries of the conventional rechargeable dry type now being currently used may be employed in the present shaver construction for operating the shaver motor. These storage batteries usually have a voltage of approximately one and onequarter volts per cell and in the present shaver the use of two storage cells for operating the shaver motor provides two and one-half volts for operating the motor. The motor is therefore designed `for operation on two and onehalf volts direct current which is delivered by the storage batteries connected in circuit, as disclosed in the wiring diagram in FIG. 19 `and as hereinabove described in the description of the various connections between the parts of the shaver. A two and one-half volt supply source of direct current may also be used to operate the motor independently of the battery by providing contacts engaging screws 23 in the sockets 24 in the outside of supporting wall 25 of cover section 2.

The selenium rectifier hereinabove described and illustrated in the wiring diagram in FIG. 19 in providing the four cell selenium bridge dry rectier construction rectiies the alternating current supply from a volt supply source into a pulsating direct current for charging the storage batteries when the rnoto'r is not in operation. When the charger casing is interengaged in attached relation as above described with the shaver casing to close the charger circuit portions between the charger casing and the shaver casing, it will open control switch 60 to open the circuit to the motor so that the charger circuit to the batteries will be closed vfor providing a means for charging the battery over a given period of time at a low -charging rate.

Condenser 10S provides an impedance in the circuit to the rectiiier bridge 104 for reducing the line voltage sufciently to provide a voltage in the storage battery circuit slightly higher than the battery voltage for charging the batteries in a Well known manner. Resistor 108 is a bleeder resistance `for the condenser.

What is claimed is:

1. An electric motor comprising a pair of spaced supporting members of insulating material, `a stator for said motor having an inner field member comprising a cylindrical body of magnetizeable material and having inner and outer surfaces in concentric relation extending between said supporting members with opposite ends engaged therewith, a metallic sleeve member slidably engaged on said cylindrical body and of substantially equal length, extending between and engaging said supporting members, a longitudinally extending slot in said sleeve, said inner field member having magnetized pole sections of substantially equal width extending between opposite ends thereof, positioning means on said inner iield member and said sleeve adapted to tix the position of said members relative to each other whereby said slot in said sleeve is disposed at the center of one of said pole -sections, an armature having a shaft extending substantially coaxially through said inner iield member with opposite ends rotatably mounted in said supporting members,

radially extending armature poles mounted on said shaft.

having a length less than said stator and pole faces on the ends of said armature poles having a width slightly less than the width of said magnetized pole sections, armature coil windings mounted on said armature poles, a commutator on said armature shaft having segments electrically connected with said coil windings, commutator brushes mounted on one of said sup-porting members with one endof each engaged with `said commutator in operative relation, terminals on said one supporting member electrically connected to the opposite ends of said brushes for connecting said armature coils in circuit with a source of electricity to operate said motor, said armature having a greater number of poles than said stator arranged so that not more than one pole face on said armature will be opposite any of said stator poles at any time, and means securing said supporting members together for retaining said motor in assembled relation.

2. An electric motor of the character claimed in claim 1, wherein said positioning means include a projection formed on said sleeve extending radially inward from said sleeve and in fixed relation to said slot, said inner tield member -being formed with a recess in the outer end portion for receiving the projection on said sleeve to tix the assembled position of said sleeve and inner field member relative to each other and said magnetic pole sections.

3. The electric motor of claim 2 wherein a projection is provided on one of said support members adapted for seating engagement in said recess of said inner eld member to tix the position of said stator thereon in predetermined position in relation to the commutator.

4. In an electric shaver having cutter means, an electric motor for operating said cutter means and a battery for supplying a source of electrical power for the motor, .said electric shaver comprising a supporting section having an opening therein, means supporting one end of the motor on lone side of said supporting section, a cap member engaged on the opposite end of said motor, means supporting said cutter means on the opposite side of said supporting section, a shaft on said motor projecting through said opening in said supporting section and operatively connected to said cutter means, securing means extending between said. supporting section and cap member securing said motor and cap member in assembled relation on said supporting member, means formed on said one side of the supporting section and on the cap member for positioning and supporting said battery closely adjacent said motor, a switch carried by said. cap member and operable to open and close an electrical circuit between said battery and motor, a cup-shaped cover section disposed over said motor, battery and switch and having upper peripheral edge portions in seated engagement with the peripheral edges of said one side of said supporting section, an access opening in said c-over section for said switch, a handle on said switch disposed in said access opening for manually operating said switch from without said cover section, and means detachably connecting said cover section to said supporting section whereby said cover section is readily removed from said supporting section to expose said battery, motor and switch in assembled operative relationship.

5. In an electric dry shaver comprising cutter means, 4an electric motor for operating said cutter means and a battery for supplying a source of electrical power for the motor, said electric shaver comprising a casing including a supporting section having an opening provided therein, said motor including a tubular-shaped stator and a rotor, means on said supporting section for positioning one end of the stator on one side of said supporting section, means -supporting said cutter means on the opposite side of said supporting section, la shaft on said rotor projecting through said opening and in operative connection with said cutter means, an end cap member engaged on the opposite end of said stator and having an outer cylindrical surface, said supporting section and end cap member having aligned bearings with the opposite ends of said shaft rotatably mounted therein, means on said one side of the supporting section and on said cap member for positioning said battery closely adjacent said motor at the same side of said supporting section, a control switch having a bearing sleeve rotatably mounted over said outer cylindrical surface of said cap member and operable to open and close said circuit connections, a cupshaped cover section disposed over said battery, motor and switch and having upper peripheral edge portions in seated engagement with the peripheral edges of said one side of said supporting section, and securing means detachably connecting said cover section to said supporting section whereby said cover section is adapted for ready removal therefrom to expose said battery, motor and switch in assembled operative relationship.

6. A shaver as set forth in claim 5 wherein said battery is rechargeable, and wherein terminal prong members are mounted on said end cap member, circuit connections between said battery and terminal prongs, socket means formed in said cover section for positioning therein said terminal prongs at the outside of said casing whereby said prongs are adapted for connection with a source of electrical supply for charging said battery.

7. A portable electrical appliance of the type described having operating means, an electric motor for effecting operation of said operating means, and a battery for supplying a source of electrical power for the motor, said appliance comprising a casing including a cup-shaped outer cover section, a supporting section having on one side thereof a surface forming a seat for the upper peripheral edges of said cofver section, a motor disposed within said cover section and mounted on said one side of said supporting section, means on the other side of said supporting section for mounting said operating means, means on said one side of the supporting section for positioning the battery closely adjacent the motor, circuit connection means between the battery and said motor, a manually operable switch carried by |the motor and selectively operable to open and close said circuit connection means, an opening in said cover section, a handle on said switch and projecting through said opening, and means detachably securing said cover section to said supporting section whereby said cover is adapted for removal from said supporting section to expose said battery, motor and switch in assembled operative relationship.

8. An electric motor comprising a pair of spaced support members, a tu-bular stator having an inner field member including a plurality of permanent magnetized areas arranged in spaced circumferential relation thereon, an armature disposed within said stator and extending axially therethrough, said armature supported in said support members and carrying a plurality of magnetic poles on arcuate pole face portions, said stator including an outer sleeve-shaped yoke member having a longitudinal slot therein and slidably engaged on the outer surface of said inner iield member, a projection on said outer sleeve extending radially inward from said sleeve, and a recess provided in said inner ield member adapted to receive said projection to mutually position said outer and inner stator members whereby the slot in said outer sleeve member is located at the center of a magnetized area of the inner ield member.

9. The motor of claim 8 wherein said inner field member is provided with a pair of said recesses and wherein positioning means are provided on said support members adapted to engage in said recesses to locate said stator in predetermined position on said support members.

10. The motor of claim 9 wherein the positioning recesses in said inner ield member comprises key slots provided in the spaced peripheral edges thereof and said positioning means on said supporting members comprising key projections formed thereon and adapted to engage in said key slots to position said stator and prevent rotation thereof on said support members.

References Cited by the Examiner UNITED STATES PATENTS 2,465,446 3/ 1949 Gorin 310-46 2,598,211 5/1952 Beliaetf 310-46 2,662,194 12/1953 Jepson 310-50 2,763,796 9/1956 Happe S10-62 2,777,963 1/1957 Kuntz 310-86 2,978,598 4/196-1 Kato 310-43 3,043,996 6/ 1962 Hartwig 310-47 X FOREIGN PATENTS 1,051,163 2/ 1959 Germany.

MILTON O. HIRSHFIELD, Primary Examiner. I. W. GIBBS, Assistant Examiner. 

1. AN ELECTRIC MOTOR COMPRISING A PAIR OF SPACED SUPPORTING MEMBERS OF INSULATING MATERIAL, A STATOR FOR SAID MOTOR HAVING AN INNER FIELD MEMBER COMPRISING A CYLINDRICAL BODY OF MAGNETIZEABLE MATERIAL AND HAVING INNER AND OUTER SURFACE IN CONCENTRIC RELATION EXTENDING BETWEEN SAID SUPPORTING MEMBERS WITH OPPOSITE ENDS ENGAGED THEREWITH, A METALLIC SLEEVE MEMBER SLIDABLY EQUAL GAGED ON SAID CYLINDRICAL BODY AND OF SUBSTANTIALLY EQUAL LENGTH, EXTENDING BETWEEN AND ENGAGING SAID SUPPORTING MEMBERS, A LONGITUDINALLY EXTENDING SLOT IN SAID SLEEVE, SAID INNER FIELD MEMBER HAVING MAGNETIZED POLE SECTIONS OF SUBSTANTIALLY EQUAL WIDTH EXTENDING BETWEEN OPPOSITE ENDS THEREOF, POSITIONING MEANS ON SAID INNER FIELD MEMBER AND SAID SLEEVE ADAPTED TO FIX THE POSITION OF SAID MEMBERS RELATIVE TO EACH OTHER WHEREBY SAID SLOT IN SAID SLEEVE IS DISPOSED AT THE CENTER OF ONE OF SAID POLE SECTIONS, AN ARMATURE HAVING A SHAFT EXTENDING SUBSTANTIALLY COAXIALLY THROUGH SAID INNER FIELD MEMBER WITH OPPOSITE ENDS ROTATABLY MOUNTED IN SAID SUPPORTING MEMBERS, RADIALLY EXTENDING ARMATURE POLES MOUNTED ON SAID SHAFT HAVING A LENGTH LESS THAN SAID STATOR AND POLE FACES ON THE ENDS OF SAID ARMATURE POLES HAVING A WIDTH SLIGHTLY LESS THAN THE WIDTH OF SAID MAGNETIZED POLE SECTIONS ARMATURE COIL WINDINGS MOUNTED ON SAID ARMATURE POLES, A COMMUTATOR ON SAID ARMATURE SHAFT HAVING SEGMENTS ELECTRICALLY CONNECTED WITH SAID COIL WINDINGS, COMMUTATOR BRUSHES MOUNTED ON ONE OF SAID SUPPORTING MEMBERS WITH ONE END OF EACH ENGAGED WITH SAID COMMUTATOR IN OPERATIVE RELATION, TERMINALS ON SAID ONE SUPPORTING MEMBER ELECTRICALLY CONNECTED TO THE OPPOSITE ENDS OF SAID BRUSHES FOR CONNECTING SAID ARMATURE COILS IN CIRCUIT WITH A SOURCE OF ELECTRICITY TO OPERATE SAID MOTOR, SAID ARMATURE HAVING A GREATER NUMBER OF POLES THAN SAID STATOR ARRANGED SO THAT NOT MORE THAN ONE POLE FACE ON SAID ARMATURE WILL BE OPPOSITE ANY OF SAID STATOR POLES AT ANY TIME, AND MEANS SECURING SAID SUPPORTING MEMBERS TOGETHER FOR RETAINING SAID MOTOR IN ASSEMBLED RELATION. 